Apparatus for making butt joined tubes and pipes



Jan. 16, 1934. Yw 1,944,096

APPARATUS FOR MAKING BUTT JOINED TUBES AND PIPES Original Filed June 1,1927 4 Sheets-Sheet l Jan. 16, 1934. H. MAYwEG 1,944,096

APPARATUS FOR MAKING BUTT JOINED TUBES AND PIPES Original Filed June 1,1927 4 Sheets-Sheet 2 I #aaoy/Va W $21 awn/MW Jan. 16, 1934. v H, MAYWEG1,944,096

APPARATUS FOR MAKING BUTT JOINED TUBES AND PIPES Original Filed June 1,1927 4 Sheets-Sheet 5 gnwntoz Haso flay/4 8G,

Jan. 16, 1934. H. MAYWEG 1,944,095

APPARATUS FOR MAKING BUTT JOINED TUBES AND PIPES Original Filed June 1,1927 4 Sheets-Sheet 4 I z E ICI" I .5 I u I l i I ,9, I I I I F I I I IW i i 1 I 60 II I Z l 9 l l I 6o I I l I l I I, -67 i I l l I Q I I I II I I I I I I I I I I l I i I O I I I I I I l I l I I 79 I 1 v I l l I IVI @611) I -I gnwnkw I 1.; 1

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Patented Jan. 16, 1934 PATENT OFFICE APPARATUS FOR MAKING BUTT JOINEDTUBES AND PIPES Hugo Mayweg, Holzwickede, Germany, assignor, by mesneassignments, to Laura S. Stevenson,

Wheeling, W. Va.

Original application June 1, 1927, Serial No. 195,689. Divided and thisapplication May 29, 1929, Serial No. 366,976. Renewed December 3,

13 Claims.

This invention relates to the making of butt oined tubes and pipes, andhas for its prime object to provide an improved apparatus for thecontinuous production of a tubular shape from a a cold metal strip orblank which is first subjected to a series of operations and therebyformed into a tube with the edges of the blank in abutted relation,immediately after which the abutted edges of the blank are electricallyjoined, the finished tube being subsequently straightened and out intolengths. The tube is fed to and through the electric apparatus by meansof the traveling movement imparted to the tube by the action of therolls employed in shaping the blank into tubul; lar form, and thecapacity of the electric apparatus is such as to produce an efficientjoint at the rate of speed imparted to the tube by the rolls of the tubeforming machine or apparatus.

This application is a division of my copending application filed June 1,1927, Serial No. 195,689.

The invention has been illustrated in the accompanying drawings wherein,

Figure 1 is a side elevation, more or less dia grammatic and partly insection, of atube shaping and joint forming apparatus embodying thefeatures of the present invention;

Figure 2 is a cross sectional view of a tube blank having itslongitudinal edges bevelled by the first pass of the tube formingmachine;

Figure 3 is a similar view showing the plate having its bevelled edgesbent into flanges projecting at that side of the blank which is to bethe exterior of the tube;

Figures 4, 5, 6, '7 and 8 are views of the blank in its successivestages of formation;

Figure 9 is an enlarged fragmentary detail view of the rolls employedfor bevelling the edges of the blank;

Figure 10 is an enlarged detail fragmentary 0 view showing thearrangement of the rolls for bending the flanged edges of the blank;

Figure 11 is an enlarged cross sectional view of a portion of theelectric apparatus;

Figure 12 is a detail fragmentary plan view of Figure 11;

Figure 13 is a side elevation of Figure 12; and

Figures 14 and 15 are enlarged fragmentary views showing the cooperativerelation between the seam of the tube and one ofthe electrodes of theelectric apparatus.

Figure 16 is a fragmentary side elevation, partly in section, showingthe bracket mounting for the shaft of one of the electrode rolls.

The apparatus of the present invention includes a tube shaping orforming apparatus designated in general by the reference character A,and an electric apparatus designated in general by the referencecharacter 13, the two machines being arranged in close proximity to oneanother so that the electric machine may receive the tubular shapeimmediately as it is fed from the tube shaping machine. The tube makingmachine is provided with pairs or sets of cooperating rolls forperforming the successive bending or shaping operations upon the blank,and said rolls are arranged to produce the successive passes which havebeen designated 2, 3, 4, 5, 6, 7 and 8, through which the blank iscontinuously fed and shaped to the final product.

In'order that the operation may be a continuous one, it is proposed tohave the cold blank C put up in a roll or coil D which is mounted: upona suitably supported reel E. Located between the reel E and the feed-inend of the tube shaping machine A, there is a suitable track 10supported in a horizontal position in any suitable manner as upon legstandards 11. The track 10 is below the horizontal line of the passes ofthe tube shapingmachine and supports a carriage 12 mounted to travelback and'forth on the track and beneath the horizontal line of thepasses. Suitable clamping devices 13 and 14 are provided upon thecarriage so as to clamp thereupon the rear end of one tube blank and thefront end of another tube blank with said ends in abutted relation sothat they may be welded by any suitable means, as for instance by a gastorch 15 carried by a carriage. It will of course be understood that anyform of welding means may be employed, as the form of the welding meansconstitutes no part of the present invention. The clamps 13 and 14 arehand operated, and are manually released just before the carriagereaches the end of the track adjacent the 1 tube forming machine, andthe carriage is returned to its original position by a weight 16 and acord 17 connected to the carriage and travelling over a guide pulley 18.

As the tube blank C travels through pass 2, its longitudinal edges areprovided with the bevels 19 as'shown in Figures 2 and 9. The pass desig-'nated 2 is defined by a lower horizontally disposed plain faced roll20, and an upper composite roll consists of a cylindrical plain facedroll 21 and end roll sections 22 of greater diameter than theintermediate roll section 21 and provided with inner bevelled endportions 23. The lower roll 20 embraces a noncircular portion of a shaft24 having a fixed annular collar or shoulder 25 against which one end ofthe roll 20 is held by means of nuts 26 provided upon the screw threadedportion 2'7 of the shaft 24. Similarly the upper roll sections embrace anon-circular portion of a shaft 28 having a collar 29 against which oneend of the composite roll is held by means of nuts 30 fitting the screwthreaded portion 31 of the shaft. By this construction, the roll partsmay be replaced when worn and may be substituted by different sizes ofparts in accordance with the thickness and width of the tube blank andthe character of the bevel to be produced upon the blank.

Immediately upon being fed out of the pass designated 2, the bevelledtube blank is fed into the pass designated 3 and its bevelled edges bentinto flanges 32, as shown in Figures 3 and 10, said flanges beingprojected at the lower side of the blank which is to be the exterior ofthefinished tube in its final form. The pass designated 3, as shown inFigure 10, is made up of an upper plain faced cylindrical roll 33mounted on a horizontal axis, a lower plain faced cylindrical roll 34having its ends bevelled as at 35 and mounted upon a horizontal axisbelow and in alignment with the roll 33, and a pair of opposite rolls 36and 37 mounted upon vertical axis in the same plane with the axis of theroll 33 and 34, and provided with the bevelled faced portions 38 and 39,which, together with the bevelled end portion 35 of the lower roll 34bend and shape the bevelled edges of the blank C into the flange 32. Thesucceeding passes 4, 5, 6, '7 and 8 shape the blank progressively inaccordance with Figures 4, 5, 6, '7 and 8 of the drawings. It willtherefore be understood that as the blank emerges from the last passdesignated 8 it will have been bent into the tubular shape C" shown inFigures 8 and 14 with its bevelled edges 19 in, partially abuttedrelation and the flanges 32 disposed longitudinally of the tube on theexterior thereof. The bevelled or inclined edges 19 of the blank do notabut throughout their widths, but come together at their outer edgeportions only, thereby leaving a substantially V-shaped space betweenthe abutted edges of the blank at the inner side of the tube. The twoflanges 32 constitute an external rib extending longitudinally of thetube and of V-shape in cross section. It will here be noted, as bestshown in Figure 14 of the drawings, that the widest dimension a of thecombined ribs or flanges 32 at the exterior of the tube is less than thethickness 2) of the blank for an important purpose as will behereinafter explained. Immediately after the tubular shaped blankemerges from the last pass 8, it is subjected to the action of theelectric welding machine for the purpose of fusing the external rib, sothat fused portions thereof may flow downwardly and fill the gap betweenthe lower portions of the spaced edges 19 of the blank and thereby joinsuch edges in a welded joint in a simple and efficient manner. Thetubular shape is fed to the electric welding apparatus by reason of thetravel of the blank through the tube forming machine, whereby the tubeforming machine and the elec tric machine operate successively andcontinuously upon a single blank as it is travelling through theapparatus under the feeding effect of the driven rolls of the tubeforming machine.

The tubular shape C, in the cross sectional shape shown in Figure 8,travels from the last pass 8 of the tube forming machine into theelectric machine and between the cooperating idle-rolls 40 and 41,Figures 11, 12 and 16, which have concaved peripheries so as to define aseat or pass for receiving, guiding and supporting the tube 0'. Themountings for the rolls 40 and 41 are duplicates, and therefore adescription of one of the mountings is deemed sufficient. Each of theserolls is carried by an upstanding rotatable pindle 42 mounted in upperand lower bearings 43 and 44 carried by a bracket 45, pivoted at itslower end as at'46 upon a hanger 47 secured to and depending from a part48' of the frame of the machine. By the pivotal mounting of the bracket45, the rolls 40 and 41 may be adjusted towards and awayfrom one anotherto vary the size of the pass or gap between the rolls for the purpose ofaccommodating tubes of different diameters. For convenience in adjustingthe positions of the rolls 40 and 41, there is provided a horizontal androtatable adjusting member 49 which is mounted between its ends in asuitable bearing 50 carried by the hanger 4'7 and located between thepivotally adjustable brackets 45. The respective end portions of therotatable bar 49 are reversely screw threaded, and each end portion isreceived within a nut 51, best shown in Figure 16 of the drawings, saidnut having trunnions 52, received respectively in abearing p ning 53 inthe pivoted bracket 45 and the substantially L-shaped bracket 54provided upon the front face of the pivotal bracket 45, whereby the nuts51 will remain in a horizontal position with the adjusting rod 49 andthereby acoommodate themselves to the tilting adjustments of the pivotalbrackets 45. A detachable crank handle 55, or other suitable means, maybe em- Ployed for rotating the rod 49 to adjust the positions of thepivotal bracket members 45.

Each roll spindle 42 extends below the lower bearing bracket 44 and dipsinto a mercury bath contained in a cup or receptacle 56 which is carriedby a cross head 5'7 bolted or otherwise secured to one of the poleterminals 58 of the secondary 59 of any suitable form of electrictransformer. The lower end portion of the spindle which is within thebath is grooved, either circumferentially, as shown, or longitudinally,so as to expose a large surface area to the mercury contained in the cupor receptacle 56. The internal diameter of the cup or receptacle 56 issuch as to permit of the necessary tilting of the spindle 42 in theadjustments thereof. It will now be understood that the rolls 40 and 41are electrically connected to the pole piece 58 through their spindles42 and the mercury contents of the cups or receptacles 56, and thereforethe rolls 40 and 41 constitute one of the pole members of the weldingmachine.

Disposed horizontally and diametrically across the tops of the rolls 40and 41 is the other pole member 60 of the electric machine, said polemember being in the form of a cylindrical roll or bar provided at itsmiddle with a band or collar 61 preferably of copper and disposed so asto come into proper cooperative relation with the rib on the exterior ofthe tubular shape C. Each end of the member 60 is provided with ajournal 62 rotatable within an anti-friction bearing 63 carried by andinsulated from a substantially horizontal link or arm 64 pivoted upon anupstanding bracket arm 65 rising from a frame portion 66 of the machine.As best shown in Fignected by a base member 6'7 mounted to slide endwisein a guideway 68 provided upon the top of the frame portion 66. Theopposite arms or links 64 are connected by a rod or bar 69 rotatablymounted in the bracket 65 so that the two arms ure 12, it will be seenthat the brackets 65 are conaeaaces is 64 are connected forsirnuitaneous up and down movements. Downward movement of each arm 64 islimited by means of a shoulder we depend ing from the arm and disposedfor engagement with a set screw 71 carried in a screw threaded boss 72provided upon the outer face of the adjacent post or bracket 65. Underoperating conditions, and as well shown in Figures 14 and 15 of thedrawings, it will be seen that the pole member 61 rests upon the tubularshape C and against the rib 32 and supports the arms 64 in the positionindicated in Figure 13 with the part slightly in advance of the setscrew 71. When there is no Work in the machine, the part 70 engages theforward end of the set screw 71 so as to maintain the pole piece 61 inproper position for engagement with the external rib of a tubular shapewhich is being entered into the welding machine.

It is proposed to longitudinally reciprocate the pole member 60 so as towork the pole piece 61 transversely across the rib on the tube andthereby prevent the wearing of a groove in the periphcry of the polepiece 61. To accomplish this result, the base member 67 is reciprocatedendwise through the medium of an oscillating arm 73 fulcrumed as at 74upon the frame part 66 and connected at one end by means of a pivotallink 75 with the base member 67. The other end of the arm 73 is slottedat 76 to receive a wrist pin 77 carried by an eccentric 78 mounted uponthe frame part 66 and suitably driven from some operating part of thegeneral apparatus.

As best shown in Figure 11 of the drawings, it will be seen that eachend of the pole member 60 is provided with a circular head 79, groovedperipherally as at 80, and having its lower portion dipped into amercury bath in a mercury cup or container 81 carried by the upper endof an arm standard 82 rising from the cross head 83 suitably secured tothe other pole piece 84 of the secondary 59, whereby the electriccircuit will be completed from the tubular shape C through the polemember 60, the heads 79, the standards 82 and the cross head 83.

After passing from the electric machine, the welded tube C passesthrough a finishing and straightening machine F of any ordinary orpreferred form. As shown in Figure 1 of the drawings, the machine Fincludes finishing rolls 85 for smoothing the exterior of the pipe, andbending rolls 86 for straightening the tube or pipe. After passing fromthe finishing and straighten ing machine F, the tube or pipe is run intoany desired form of tube cutting machine, not shown, for the purpose ofcutting the finished tube into lengths.

The action of the electric machine will be best understood by referenceto Figures 11, i2, 14 and 15 of the drawings. In the beginning of theoperation, as well shown in Figure 11, the pole piece 61 rests upon theapex of the pointed external rib 32 on the tubular shape b whereby thetip edge of the rib becomes fused and the pole piece sinks down into therib to about the position shown in Figures 14 and 15 of the drawings,whereby the rib will be fused throughout substantially its entire depthas the tubular shape is fed through the machine under the feedinginfluence of the driven rolls of the tube shaping machine A. Underoperating conditions, the weight of the pole piece 60 and its associatedparts is supported upon the tubular shape I), shown in Figures 14 and15, and as the latter supported in the seat defined by the rolls is andstood that tube forming machine is driven a member 60 will reciprocatetransversely across the rib under the action of the oscillating arm 73.It will of course be understood that the size of the mercury cups 81 issuilicient to permit of the necessary lateral play of the contact head79 in the mercury baths. As the rib 32 is fused, the molten metal runsdown and fills the gap between the spaced edge portions 19 of the blankwhich produces a strong and durable joint without producing any internalrib on the completed tube while at the same time filling the gap betweenthe edges of the blank without leaving a groove at the interior of thetube.

It will here be explained that there is no welding of the joint in thesense of softening metal members and then applying pressure theretosufiicient to unite the softened parts into a welded joint, for thereason that the fused parts of the flanges gravitate into the gap whichis filled by the fused metal, and such fused metal when it hardensunites the edges of the blank in a strong and durable seam orjoint.

The large dimension a of the combined flanges 32 is less than thethickness 1) of the blank or the wall of the tube, whereby the electriccurrent is concentrated in the combined flanges or rib and fusion islimited thereto, so that burning of the walls of the tube adjacent thebutt weld is effectually prevented.

In the practice of the invention, and in order that it may becontinuous, the tube blank C is in the form of a long strip of thedesired thickness and width. For convenience in handling; the cold stripis wound into a coil, as indicated at D, Figure 1, and mounted on thereel E. The end of the strip or blank is fed to the roll forming machineA and entered by hand into the bite of the driven rolls constituting thefirst pass designated 2, and thereafter the blank is fed automaticailythrough the entire apparatus under the feeding action of the drivenrolls cf the tube forming machine It will of course be Linden takesplace in the electric machine, as hereinbefore described, and thereafterthe completed tube C passes on to the finishing" and straighteningmachine F and thence to a tube cutting machine, not shown, for thepurpose of cutting the com-- hi1; pleted tubes into lengths.

From the foregoing explanation of the y ing operations are performedcontinuously upon the same s that the work emerges the nor internalgrooves. The manual labor expended is reduced to the minimum.

By reason of the contact of the pole member 61 with the thin apex of theexternal rib 32, immediate and effective fusion of the relatively thinedge of the rib is obtained, which permits of the formation of the seamas rapidly as the shape C can be formed by the tube forming machine Aand fed thereby to the electric machine. This rapid formation of theseam permits of the said operation following immediately upon thecompletion of the final step of the tube shaping operations, andtherefore permits the operation of the tube shaping machine at itsnormal rate of speed. In actual practice, tubes have been made inaccordance with the present invention at the rate of'twenty feet perminute.

As hereinbefore explained overheating is prevented because of thetriangular shape of the external rib 32, together with the fact that thewidth of the base of the rib is less than the thickness of the blank, sothat the electric current is concentrated in said rib and thereforeburning of the blank adjacent the joint is impossible. Actual practicehas shown that even great irregularities in the thickness of the blankor metal strip have no undesirable influence on the formation of thejoint, and therefore it is possible to use crude, or so called hot orcold rolled metal strips which are seldom uniform in their dimensions.Moreover the electric current consumption is low, as the heat isconcentrated at the fusion zone.

What is claimed is:

1. In an apparatus for the continuous formation of tubing, thecombination of means for continuously and progressively shaping a blankinto tubular form and feeding it endwise, and an electric devicedisposed to receive the tubular shape as it emerges from the tubeshaping means, said electric device having a pair of idle electroderolls of the same polarity disposed to form a pass to receive guide andsupport the tubular work piece, another idle electrode roll of the otherpolarity disposed for engagement by the moving tubular work piece, andmeans for reciprocating said other electrode roll transversely acrossthe work piece, said tube shaping means also constituting feeding meansfor feeding the tubular shape through the electric device each of saidelectrode rolls being adapted for rotation by frictional contact withthe moving work piece.

2. In an apparatus for the continuous formation of tubing, thecombination of means for continuously and progressively shaping a blankinto tubular form and feeding it endwise with the edges of the blankdisposed as flanges projecting at' the top of the tubular shape, and anelectric device disposed to receive the tubular shaping as it emergesfrom the tube shaping means, said electric device having a pair of idleelectrode rolls of the same polarity mounted upon upright axes anddisposed to define a pass to receive guide and support the tubular shapetherebetween and in engagement therewith, and another idle electroderoll of the opposite polarity disposed above the first mentioned rollsin position to engage the top edges of the flanges, and means to reciprocate said other electrode said tube shaping means also constitutingfeeding means for feeding the tube through the electric device rolltransversely of the pass defined by the first mentioned rolls, each ofsaid rolls being mounted for rotation by frictional contact with themoving work piece.

3. In an electric-device, the combination of a pair of idle electroderolls of the same polarity mounted upon vertical axes and disposed todefine a pass for the reception of a work piece, another electrode rollof the opposite polarity disposed transversely of the pass defined bythe first mentioned rolls and in position for engagement with a workpiece in the pass, and means for reciprocating said other electrode rolltransversely of said pass.

4, In an electric device, the combination of a pair of idle electroderolls of the same polarity mounted upon vertical axes and disposed todefine a pass for the reception of a work piece, another idle electroderoll of the opposite polarity disposed for engagement with a shape insaid pass, means for reciprocating said other electrode rolltransversely of the pass, mercury cups of the same polarity, and contactheads carried by the reciprocatory electrode and working in therespective mercury cups.

5. In an electric device, the combination of a pair of idle electroderolls of the same polarity mounted upon vertical spindles and disposedto define a pass to receive a work piece, mercury cups of the samepolarity and receiving the spindles of the electrode rolls, means forsimultaneoTisly adjusting the spindles in the mercury cups and anotheridle electrode roll of the opposite polarity mounted for engagement witha work piece in the said pass.

6. In an electric device, the combination of a pair of idle electroderolls disposed to form a pass to receive a work piece, vertical spindlesfor the rolls, mercury cups of the same polarity and receiving thespindles, another idle electrode roll mounted for engagement 'with awork piece in the said pass, contact heads upon the said other electroderoll, mercury cups of the opposite polarity receiving the contact heads,and means for reciprocating the said other contact roll.

7. An apparatus for the continuous formation of tubing, comprising meansfor continuously and progressively feeding and shaping a blank diameteras that of the tubular form to permit the pushing of the form throughthe pass by the feeding action of the tube forming means withoutexerting welding pressure on the tubular form, and an electrode of theopposite polarity disposed for contact with the flanges of the tubularform to fuse the flanges as said form is fed through the pass.

8. An apparatus for the continuous formation of tubing, comprisingelectrodes of the same polarity disposed to form a pass for receivingand supporting the tubular form which is being fed through theapparatus, positively driven sets of forming rolls for shaping a blankinto tubular form and providing the same with external edge flanges andfor feeding the flanged form to and through the said pass, and anelectrode of the opposite polarity disposed for contact with the flangesof the tubular form to fuse the fianges as the form is fed through thepass, the electrode members being spaced to define a pass of a shape andsize to receive and permit passage therethrough of the tubular formwithout exerting welding pressure thereon.

9. An apparatus for the continuous formation of tubing, comprising meansfor continuously and progressively feeding and shaping a blank intotubular form having external edge flanges, electrodes of the samepolarity disposed to form a pass to receive a tubular form as it isdischarged from. the tube forming means and guide and support the formas it is fed along by the forming means, said pass being substantiallyof the same diameter as that of the tubular form to permit the pushingof the form through the pass by the feeding action of the tube formingmeans without exerting welding pressure on the tubular form, said passalso being open longitudinally along one side to permit the outwardprojection therethrough of the flanges of the tubular form, and anelectrode of the opposite polarity disposed for contact with the flangesof the tubular form to fuse the flanges as said form is fed through thepass.

10. An apparatus for the continuous formation of tubing, comprisingelectrodes of the same polarity disposed to form a pass for receivingand supporting the tubular form which is being fed through theapparatus, said pass being open longitudinally throughout the topthereof, positively driven sets of forming rolls for shaping a blankinto tubular form and providing the same with external edge flanges andfor feeding the flanged form to and throu h the said pass with theflanges projecting upw rdly through the open top of the pass, and anectrode of the opposite polarity disposed abo e the open top of the passand in position for contact with the flanges of the tubular form to fusethe flanges as the form is fed through the pass, the electrode membersbeing spaced to define a pass of a shape and size to receive and permitpassage therethrough of the'tubular form without exerting weldingpressure thereon.

11. An apparatus for the continuous formation of tubing, comprisingmeans for continuously and progressively feeding and shaping a blankinto tubular form having external edge flanges, electrodes of the samepolarityndisposed to form a pass to receive a tubular form as it isdischarged from the tube forming means and guide and support the form asit is fed along by the forming means, said pass being substantially ofthe same diameteras that of the tubular form to permit the pushing ofthe form through the pass by the feeding action of the tube formingmeans with out exerting welding pressure on the tubular form, anelectrode of the opposite polarity disposed for contact with the flangesof the tubular form to fuse the flanges as said form is fed through thepass, and means for reciprocating the last mentioned electrodetransversely of the pass.

12. An apparatus for the formation of tubing without exerting weldingpressure, comprising electrodes of the same polarity disposed to form apass for receiving and supporting the tubular form which is being fedthrough the apparatus, said pass being open longitudinallythroughout thetop thereof, and an electrode of the opposite polarity disposed abovethe open top of the pass and in position for contact with that portionof the tubular form which projects through the opening in the top of thepass, the electrode members being spaced to define a pass of a shape andsize to receive and permit passage therethrough of the tubular formwithout exerting welding pressure thereon.

13. In an electric device for joining parts without exerting weldingpressure, the combination of a pair of idle electrode rolls each mountedupon a vertical axis with their peripheries in cooperative relation toform a pass to receive a work piece and mutually spaced to define alongitudinal opening in the top of the pass, and another idle electroderoll mounted upon a horizontal axis extending transversely across theopening in the top of the pass for engagement by gravitation with thatportion of a work piece in said pass which projects upwardly through thelongitudinal opening, the said pair of electrode rolls being spaced todefine a pass of a shape and size to receive and permit passagetherethrough of the tubular form without exerting welding pressurethereon.

HUGO MAYWEG.

CERTIFiCATE OF CORRECTION.

Patent No. 1,944, 096.

.January 16, 1934.

HUGO MAYWEG.

It, is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 4,lines 69' to 71, claim 2, strike out the words "said tube shaping meansalso constituting feeding means for feeding the tube through theelectric device" and insert the same after "rolls," in line 72, of saidclaiin; and that the said Letters Patent should be read with thiscorrection therein to the record of the case in the Patent Office.

that the same may conform (Sell) Y i 1*. M. Hopkins Acting Commissionerof Patents.

